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Simplified representations of the proposed metabolic routes of γ-aminobutyric acid (GABA) metabolism and the key enzymes involved in symbiotic nodules. Enzymes involved include: GabD, succinate semialdehyde dehydrogenase; GabT, GABA oxoglutarate aminotransferase; GDC, glutamate decarboxylase; GOGAT, glutamate oxoglutarate amidotransferase; GS, glutamine synthetase; N2ase, nitrogenase; OpaA, omega amino acid pyruvate aminotransferase. Adapted from Prell et al.33
